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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (2*x)/(x^2)-16 // - (2*x)/(x^2)-16
y-((2*x)/(x^2))+16 = 0
y-2*x^-1+16 = 0
-2*x^-1 = -(y+16) // : -2
x^-1 = (y+16)/2
-1 < 0
1/(x^1) = (y+16)/2 // * x^1
1 = x^1*((y+16)/2) // : (y+16)/2
2*(y+16)^-1 = x^1
x = 2*(y+16)^-1
x = 2*(y+16)^-1
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